<?php

/*
 * This file is part of SwiftMailer. (c) 2004-2009 Chris Corbyn For the full copyright and license information, please view the LICENSE file that was distributed with this source code.
 */

/**
 * Handles PLAIN authentication.
 * 
 * @package Swift
 * @subpackage Transport
 * @author Chris Corbyn
 */
class Swift_Transport_Esmtp_Auth_PlainAuthenticator implements Swift_Transport_Esmtp_Authenticator {
	/**
	 * Get the name of the AUTH mechanism this Authenticator handles.
	 * 
	 * @return string
	 */
	public function getAuthKeyword() {
		return 'PLAIN';
	}
	
	/**
	 * Try to authenticate the user with $username and $password.
	 * 
	 * @param Swift_Transport_SmtpAgent $agent        	
	 * @param string $username        	
	 * @param string $password        	
	 * @return boolean
	 */
	public function authenticate(Swift_Transport_SmtpAgent $agent, $username, $password) {
		try {
			$message = base64_encode ( $username . chr ( 0 ) . $username . chr ( 0 ) . $password );
			$agent->executeCommand ( sprintf ( "AUTH PLAIN %s\r\n", $message ), array (
					235 
			) );
			
			return true;
		} catch ( Swift_TransportException $e ) {
			$agent->executeCommand ( "RSET\r\n", array (
					250 
			) );
			
			return false;
		}
	}
}
